From my own experience, Ive learned a little trick that has worked at the lower stakes so far. With TPTK, if you are the one betting and someone else is calling, you are usually ahead. Just watch the board for draws or obvious hands. If with TPTK you are the one calling, you are probably not in possession of the hand that Wins $ Showdown.

Dont go pushin all in every time either - that doesnt count.